How to fix Raycasting script not dealing damage ?

Theres not much to explain the title pretty much sums it up but heres the script

function fireBullet(start, target, maxLength)
	--settings some constants
	local directionVector = (target - start).unit
	local direcitonCFrame = CFrame.new(start, start + directionVector)
	--settings values that we're going to update throughout
	local delta, lastTick, startTime = 0, tick(), tick()
	local hit, position, lastPosition = nil, target, start
	local totalDistance = 0
	local function loop()
		local ignore2 = {
	     character;
	     M4;
	     camera;
         }
		while not hit and totalDistance < maxLength do --basically stop if we hit our max or we hit something
			delta = tick() - lastTick --get the time delta, aka time between last iteration and now
			lastTick = tick() --set this to keep out delta calculations accurate
			local travelDistance = delta * gunset.mvelocity --getting our distance for this iteration
			--velocity being in studs per second
			--Just a simple physics equation, distance = time * velocity
			--Doing this makes for constant velocity, but not consistent ray distance
			--all this does it get rid of potential lag influences really
			travelDistance = travelDistance < 999 and travelDistance or 999 --just limiting our distance, this way is faster than math.min
			totalDistance = totalDistance + travelDistance --just adding on to our total
			local dropAmount = 9.81/2 * (tick() - startTime)^2 --gravity/2 * the square of our total time to get our bullet drop amount
			local incremented = --see break down of what transformations are done below
				direcitonCFrame * --start from our directionCFrame constant
				CFrame.new(0, 0, -totalDistance) - --move forward our total distance
				Vector3.new(0, dropAmount, 0) --move down based on our bullet drop amount
			--doing this should give us an idea of where we want to be based on our calculations
			local direction = CFrame.new(lastPosition, incremented.p).lookVector --getting a look vector from where we are, to where we want to be
			--the rest you more or less had, fairly basic raycasting code
			local ray = Ray.new(lastPosition, direction * travelDistance)
			local hit,pos,normal,material = workspace:FindPartOnRayWithIgnoreList(ray,ignore2) --{workspace.Weapons, character, camera})
			if hit then
				handleBulletHit(hit,pos,normal,material)
				break
			end
			lastPosition = position
			wait(0) --would recommend waiting for one of the runservice events instead
		end
		if not hit then
			print("Distance maxed out, we hit nothing")
		end
	end
-- handle bullet part of script --

local handleBulletHit = function(hitPart, hitPoint, hitNormal,hitMaterial)
if hitPart then
	print(hitPart)
	local humPart = character:FindFirstChild("HumanoidRootPart")
    local targetHumPart = hitPart.Parent:FindFirstChild("HumanoidRootPart")
    local hithumanoid =  hitPart.Parent:FindFirstChild("Humanoid")
    if hithumanoid and targetHumPart and humPart and hithumanoid.Health > 0 then
        if hitPart.Name == "LeftLowerArm" or hitPart.Name == "LeftUpperArm" or hitPart.Name == "RightLowerArm" or hitPart.Name == "RightUpperArm" then
        remoteEvents.Hit:FireServer(hithumanoid,gunset.limbdamage,hitPart)	
	    ApplyTags(hithumanoid)
    else
    remoteEvents.Hit:FireServer(hithumanoid,gunset.damage,hitPart)	
    ApplyTags(hithumanoid)
    end
end
    if not hithumanoid then
    
end)
end
end